# def  hello():
#     print("hello,world")
#     nongda()
#
# def nongda():
#     print("furong district")
#     # hello()
#
# hello()
def add(m,k):
    print("这是加法运算操作")
    return  m + k

def mut(x,y):
    print("这是乘法运算操作")
    return  x * y

def  sub(x,y):
    print("这是{} - {}的运算".format(x,y))
    z = x - y
    print("{} - {} 的结果是{}".format(x,y,z))

# sub(7,4)
a = sub(7,4)
print(a)
he = add()
he2 = add(99,55)
he3 = mut(6,7)
# print(he,he2,he3)

